/*css reset*/
*{margin: 0;padding: 0;
    box-sizing: border-box;
    font-family:"Microsoft YaHei",Arial, Helvetica, sans-serif;
}
body{
    background-color: #e9e9e9;
}
    img{border:0;}
    a{text-decoration:none; cursor:pointer; outline:none;color: inherit;}
    ol,ul,li{list-style:none;}
    .left {
        float: left
    }
    
    .right {
        float: right
    }
    
    .clear::after {
        content: '';
        display: block;
        clear: both
    }